Why does this problem happen?

If you've lost your licenses there is a high probability the computer that hosts the Nx Witness Server application where the licenses were originally activated has been modified in some way.

What is a HWID?

The HWID is a unique 34-digit identifier (example:03000102030405060708090a0b0c0d0e0f) generated when the Nx Witness Media Server is installed on a Windows, Ubuntu Linux, or ARM device. The HWID is based on a combination of software and hardware of the computing device upon which Nx Witness is installed.

The following items are used to generate a unique HWID for each computer upon which Nx Witness is installed:

BIOS

Motherboard

RAM

Network Card (NIC)

After installing Nx Witness on a server any modification in the software or hardware items above will result in a change of HWID and an invalidation of licenses attached to that device.

Physical Change: You've added or removed RAM (RAM in a computer is often made up of multiple physical RAM units. If one unit of RAM fails in a multi-RAM unit setup your computer may continue to work fine, but your HWID will be affected).

3. The Motherboard configuration on your computer hardware has changed.

Physical Change: You've had a failed motherboard and had to replace it on the computer the licenses were originally assigned to. Changing the motherboard will result in a hardware change.

4. The BIOS on your computer hardware has changed.

Software Change: In very rare cases a Motherboard BIOS update will cause the HWID to change.